LVGL Tutorial with ESP32, We can understand better and faster through LVGL Examples #LVGL #UI

Introduction

This tutorial will guide you through using LVGL (Light and Versatile Graphics Library) with the ESP32 microcontroller, focusing on practical examples to enhance your understanding of UI development. By exploring the provided examples, you can quickly learn how to implement various UI components and animations, making it easier to create user interfaces for your projects.

Step 1: Accessing LVGL Examples

• Navigate to the LVGL library folder on your system.
• Locate the "example" folder within the LVGL directory.
• Move this folder to your source folder because the Arduino IDE references only the library's source folder.

Step 2: Opening Examples in VS Code

• Open Visual Studio Code (VS Code).
• Use VS Code to access the example folder for easier code navigation and understanding.

Step 3: Running the Hello World Example

• Find the first example titled "Get Started 1."
• Include the LVGL example header file in your project.
• Ensure the path to the example folder is correctly referenced.
• Build and flash this example to your ESP32 device:

  #include "lvgl.h"
  // Your setup code here
  

Step 4: Understanding Touch Events

• Explore the example that demonstrates touch events on buttons.
• Learn about the different states of button events:
  • Pressed
  • Released
  • Long press

Step 5: Enabling Required Components

• If you encounter errors during the build process, check the lv_conf.h file.
• Ensure that all necessary components and fonts are enabled. For example, if the Montserrat font is required, enable it in lv_conf.h:

  #define LV_FONT_MONTSERRAT_30 1
  

Step 6: Learning Object-Oriented Concepts

• Study the menu composition example that employs the observer design pattern.
• Understand the observer pattern as a design methodology that sends notifications when the state of an object changes.

Step 7: Experimenting with Examples

• Review various examples provided in the LVGL library.
• Try copying and pasting code snippets into your own projects to see how they function.
• Modify examples to better grasp UI composition and mechanics.

Conclusion

By following this tutorial, you have learned how to access and utilize LVGL examples effectively. These examples serve as valuable resources for understanding UI development with the ESP32. Continue experimenting with different components and patterns to enhance your skills further. For your next steps, explore more complex examples, or dive deeper into specific topics like animations or custom UI elements.